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```python
# AI Dev Tool: Excalidraw Diagram Agent
# ======================================

import os
import json
from typing import Dict, List
from fastapi import FastAPI, Request
from fastapi.responses import JSONResponse
from pydantic import BaseModel
from excalidraw import Excalidraw

# Define the Excalidraw diagram agent model
class DiagramAgent(BaseModel):
    """Excalidraw diagram agent model"""
    id: str
    name: str
    elements: List[Dict]

# Initialize the FastAPI application
app = FastAPI()

# Load the Excalidraw diagram agent configuration
with open('config.json') as f:
    config = json.load(f)

# Define the Excalidraw diagram agent instance
excalidraw = Excalidraw(config['excalidraw_url'])

# Define the API endpoint to create a new diagram
@app.post("/diagrams")
async def create_diagram(request: Request):
    """
    Create a new Excalidraw diagram.

Returns:
        JSONResponse: The created diagram ID.
    """
    try:
        # Create a new Excalidraw diagram
        diagram_id = excalidraw.create_diagram()

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